OK, I got one for you:
Take a picture of whatever, and make a new layer over top of it.
Use the Wave filter to create a bunch of waves. Use the Magic Wand with some tolerance and select the waves you just made. Do a feather on the selection of about 10 pixels or so. Then do a filter of your choice (I like Glowing Edges) on your selected area. It'll give you a cool effect like the pic I made a while below:
Also, for tutorials, go to
http://good-tutorials.com